A Comprehensive Modeling and Simulation of Gasoline Direct Injection using KIVA-4 code
Published August 30, 2011 by SAE International in United States
Annotation of this paper is available
In the present study a LES numerical modeling is carried out for a GDI using KIVA-4 CFD code. Thereby a comprehensive model for the fuel injection process as encountered in IC engine injectors is integrated in a Eulerian-Lagrangian framework. The injector represents a continental piezoinjector with outwardly opening nozzle. The model includes atomization, collision, evaporation and SGS turbulence models. The atomization is described with a combined primary and secondary atomization model. For the primary atomization, a LISA model is used, which is based on the assumption of formation of unstable hollow sheet close to nozzle exit, while a TAB based model is used for the secondary atomization. A new appropriate collision-coalescence model that is independent of mesh size and type is suggested and integrated into the spray model. It accounts for different regimes of droplet-droplet interactions (e.g. bouncing separation, stretching separation, reflective separation and coalescence). The resulting spray model is coupled to a LES of the carrier phase based on a Smagorinsky model. The simulation results are compared satisfactory with experimental data with respect to velocity profile, spray penetration depth, spray visualization image and droplets distribution profile.
CitationNishad, K., Sadiki, A., and Janicka, J., "A Comprehensive Modeling and Simulation of Gasoline Direct Injection using KIVA-4 code," SAE Technical Paper 2011-01-1899, 2011, https://doi.org/10.4271/2011-01-1899.
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